Agincourt, Battle of

25 October 1415. The monumental battle between Henry V and the French forces arrayed against him, slaying three French dukes , the constable of France, nine counts , 90 lords and more than 5,000 knights . The battle crushed the French resistance to Henry’s renewed claim to the French throne, resulting in the Treaty of Troyes, 1420, in which Henry was betrothed to Catherine and thus their heir of France. It was this battle that Shakespeare immortalized in his "Saint Crispen’s Day" speech in Henry V.